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The Collaborative International Dictionary
Interscribing

Interscribe \In`ter*scribe"\, v. t. [imp. & p. p. Interscribed; p. pr. & vb. n. Interscribing.] [L. interscribere; inter between + scribere to write.] To write between. [R.]

Wiktionary
interscribing

vb. (present participle of interscribe English)